/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.util;



import com.google.auto.value.AutoValue;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableMap;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;



import java.io.IOException;

import java.io.InputStream;

import java.io.Serializable;

import java.util.Map;

import java.util.Properties;



/**

 * Properties pertaining to this release of Apache Unified.

 *

 * <p>Properties will always include a name and version.

 */

@AutoValue

public abstract class ReleaseInfo implements Serializable {

  private static final String PROPERTIES_PATH = "/com/bff/gaia/unified/sdk/sdk.properties";



  /** Returns an instance of {@link ReleaseInfo}. */

  public static ReleaseInfo getReleaseInfo() {

    return LazyInit.INSTANCE;

  }



  /** Returns an immutable map of all properties pertaining to this release. */

  public abstract Map<String, String> getProperties();



  /** Provides the SDK name. */

  public String getName() {

    return getProperties().get("name");

  }



  /** Provides the SDK version. */

  public String getVersion() {

    return getProperties().get("version");

  }



  /////////////////////////////////////////////////////////////////////////

  private static final Logger LOG = LoggerFactory.getLogger(ReleaseInfo.class);

  private static final String DEFAULT_NAME = "Apache Unified SDK for Java";

  private static final String DEFAULT_VERSION = "Unknown";



  private static class LazyInit {

    private static final ReleaseInfo INSTANCE;



    static {

      Properties properties = new Properties();

      try (InputStream in = ReleaseInfo.class.getResourceAsStream(PROPERTIES_PATH)) {

        if (in == null) {

          LOG.warn("Unified properties resource not found: {}", PROPERTIES_PATH);

        } else {

          properties.load(in);

        }

      } catch (IOException e) {

        LOG.warn("Error loading Unified properties resource: ", e);

      }

      if (!properties.containsKey("name")) {

        properties.setProperty("name", DEFAULT_NAME);

      }

      if (!properties.containsKey("version")) {

        properties.setProperty("version", DEFAULT_VERSION);

      }

      INSTANCE = new AutoValue_ReleaseInfo(ImmutableMap.copyOf((Map) properties));

    }

  }

}